/*
 *   Z M O D E M . H     Manifest constants for ZMODEM
 *    application to application file transfer protocol
 *    01-15-87  Chuck Forsberg Omen Technology Inc
 */

#define ZPAD	'*'	/* 052 Padding character begins frames */
#define ZDLE	030	/* Ctrl-X Zmodem escape - `ala BISYNC DLE */
#define ZDLEE	(ZDLE^0100)	/* Escaped ZDLE as transmitted */
#define ZBIN	'A'	/* Binary frame indicator */
#define ZHEX	'B'	/* HEX frame indicator */
#define ZBIN32	'C'	/* Binary frame with 32 bit FCS */

/* Frame types (see array "frametypes" in zm.c) */
#define ZRQINIT	    0	/* Request receive init */
#define ZRINIT	    1	/* Receive init */
#define ZSINIT	    2	/* Send init sequence (optional) */
#define ZACK	    3	/* ACK to above */
#define ZFILE	    4	/* File name from sender */
#define ZSKIP	    5	/* To sender: skip this file */
#define ZNAK	    6	/* Last packet was garbled */
#define ZABORT	    7	/* Abort batch transfers */
#define ZFIN	    8	/* Finish session */
#define ZRPOS	    9	/* Resume data trans at this position */
#define ZDATA	   10	/* Data packet(s) follow */
#define ZEOF	   11	/* End of file */
#define ZFERR	   12	/* Fatal Read or Write error Detected */
#define ZCRC	   13	/* Request for file CRC and response */
#define ZCHALLENGE 14   /* Receiver's Challenge */
#define ZCOMPL	   15	/* Request is complete */
#define ZCAN	   16	/* Other end canned session with CAN*5 */
#define ZFREECNT   17	/* Request for free bytes on filesystem */
#define ZCOMMAND   18	/* Command from sending program */
#define ZSTDERR    19	/* Output to standard error, data follows */

/* ZDLE sequences */
#define ZCRCE	'h'	/* CRC next, frame ends, header packet follows */
#define ZCRCG	'i'	/* CRC next, frame continues nonstop */
#define ZCRCQ	'j'	/* CRC next, frame continues, ZACK expected */
#define ZCRCW	'k'	/* CRC next, ZACK expected, end of frame */
#define ZRUB0	'l'	/* Translate to rubout 0177 */
#define ZRUB1	'm'	/* Translate to rubout 0377 */

/* zdlread return values (internal) */
/* -1 is general error, -2 is timeout */
#define GOTOR	0400
#define GOTCRCE (ZCRCE|GOTOR)   /* ZDLE-ZCRCE received */
#define GOTCRCG (ZCRCG|GOTOR)   /* ZDLE-ZCRCG received */
#define GOTCRCQ (ZCRCQ|GOTOR)   /* ZDLE-ZCRCQ received */
#define GOTCRCW (ZCRCW|GOTOR)   /* ZDLE-ZCRCW received */
#define GOTCAN  (GOTOR|030)     /* CAN*5 seen */

/* Byte positions within header array */
#define ZF0     3       /* First flags byte */
#define ZF1     2
#define ZF2     1
#define ZF3     0
#define ZP0     0       /* Low order 8 bits of position */
#define ZP1     1
#define ZP2     2
#define ZP3     3       /* High order 8 bits of file position */

/* Bit Masks for ZRINIT flags byte ZF0 */
#define CANFDX  01      /* Rx can send and receive true FDX */
#define CANOVIO 02      /* Rx can receive data during disk I/O */
#define CANBRK  04      /* Rx can send a break signal */
#define CANCRY  010     /* Receiver can decrypt */
#define CANLZW  020     /* Receiver can uncompress */
#define CANFC32 040     /* Receiver can use 32 bit Frame Check */

/* Parameters for ZSINIT frame */
#define ZATTNLEN 32     /* Max length of attention string */

/* Parameters for ZFILE frame */
/* Conversion options one of these in ZF0 */
#define ZCBIN   1       /* Binary transfer - inhibit conversion */
#define ZCNL    2       /* Convert NL to local end of line convention */
#define ZCRESUM 3       /* Resume interrupted file transfer */
/* Management options, one of these in ZF1 */
#define ZMNEW   1       /* Transfer if source newer or longer */
#define ZMCRC   2       /* Transfer if different file CRC or length */
#define ZMAPND  3       /* Append contents to existing file (if any) */
#define ZMCLOB  4       /* Replace existing file */
#define ZMSPARS 5       /* Encoding for sparse file */
#define ZMDIFF  6       /* Transfer if dates or lengths different */
#define ZMPROT  7       /* Protect destination file */
/* Transport options, one of these in ZF2 */
#define ZTLZW   1       /* Lempel-Ziv compression */
#define ZTCRYPT 2       /* Encryption */
#define ZTRLE   3       /* Run Length encoding */

/* Parameters for ZCOMMAND frame ZF0 (otherwise 0) */
#define ZCACK1  1       /* Acknowledge, then do command */
/* End of Zmodem.h source */